Question

3. Find the total charge in Coulombs of the following:
a. 285 protons
b. 402 electrons

Answer 1

The "quantum" of charge is 1.602 x 10⁻¹⁹ Coulomb ... positive on a proton and negative on an electron.

a. 285 protons = (285) x (+1.602 x 10⁻¹⁹ C) = +4.566 x 10⁻¹⁷ C.

b. 402 electrons = (402) x (-1.602 x 10⁻¹⁹ C) = -6.44 x 10⁻¹⁷ C.